Airmeter pulls live PM2.5 and NO₂ values so you can understand the quality of the air you are breathing. A drifting particle field floats in front of you, getting denser and heavier the worse the air actually is. Clean air is a few faint specks. Standing in serious pollution is a thick, slow haze closing in around you. You feel the air quality instead of just reading it. For the Meta Raybans version, there a 7-day trend and the best time to head out, as well as a leaderboard for different cities worldwide. For the smartphone version we worked with the Residents Association in Rectory Road, London, and were sponsored by Breathe London, who are supported by the Mayor of London and Bloomberg Philanthropies, to create the smartphone version of Airmeter. We're now expanding to all 200 air quality monitors installed throughout London.